Start with the website and geographic scope you actually serve
The 2020–2024 ACS five-year population estimate is 16,586, with a margin of error of 410. For hosting, the practical implication is narrower: define which site, subdomains, forms and service-area pages are in scope for a firm serving Mattoon, and distinguish Mattoon pages from pages addressing the wider Coles County area or other Illinois locations.
Recommended approach
Bring a current site map and domain list to the review. Ask Bosseo to identify what would be hosted, what would remain with another provider, and how any Mattoon- or Coles County-focused pages would be tested after a move.
